Question

What is the proper way to accept user input in a view and then transfer it to that view’s controller? I know the NotificationCenter is one option, but surely there is a more elegant way to transfer data from a view to its controller?

All help is greatly appreciated and I always accept an answer!

Answer 1

You’re looking for Delegation or a Data Source. You can see more information about this here, Delegation and Data Sources

A brief example of this would be, something along the lines of this:

  //MyViewSubclass.h

  @protocol MyViewSubclassDelegate
  //Implement your delegate methods here.
  -(void)didTouchView; 
  @end

  @interface MyViewSubclass {

     id<MyViewSubclassDelegate>delegate;
  }
  @property(nonatomic,assign)id<MyViewSubclassDelegate>delegate;

Of course, @synthesize your delegate in MyViewSubclass.m

Now in the class’s header, that you want the delegate of MyViewSubclass to be, you need to conform to the `MyViewSubclassDelegate Protocol.

 #import "MyViewSubclass.h"
 @interface MyViewController : UIViewController <MyViewSubclassDelegate>

In your @implementation of MyViewController., implement the MyViewSubclassDelegate method of -(void)didTouchView.

When you initialize and create your MyViewSubclass object, you set MyViewController as the delegate:

myViewSubclass.delegate = self // Self being MyViewController.

In your MyViewSubclass, when you’re ready to forward any information, or simply want to fire a method you would do [self.delegate didTouchView]

Hope this helps !